Identifying The Size Of The Cassette - Canon NP6621 Service Manual

H. Identifying the Size of the
Cassette
Specific photointerrupters (Q651, Q652, Q653,
Q654) turn OFF or ON when a cassette is slid into
a cassette holder.
Configuration
Cassette size
No cassette
B5R (182 257)
A4 (297 220)
A3 (297 420)
Mini (STMTR) 5.5"
(148 216)
Legal 8.5" 14"
(356 216)
Letter 11" 8.5"
(279 216)
A4R (210 297)
Letter R 8.5" 11"
(216 279)
A5R (149 218)
A5 (218 149)
Mini-R (STMT) 8.5"
(216 148)
B5 (257 182)
B4 (364 257)
Ledger 11" 17"
(182 257)
*U
(182 ~ 283 198 ~ 354)
1: Photointerrupter blocking the light.
0: Photointerrupter not blocking the light.
* Sizes may be stored in memory within dimensions given (in mm; see the Service Handbook for details).
COPYRIGHT © 1998 CANON INC.
Q651
(left)
0
0
0
0
8.5" 0
0
0
0
1
1
1
5.5" 1
1
1
1
1
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Specific combinations of the states (ON/OFF) of
the photointerrupters are used by the microprocessor
on the DC controller PCB to identify the presence/
absence of a cassette and the size of the cassette
(if any) and to control scanner reversal and blank
exposure. (See Table 3-402.)
Q652
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table 3-402
OPERATIONS AND TIMING
Q653
Q654
(right)
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
(unit: mm)
3–85